Low-Impact Falls: Why Older Adults Often 'Just Go Down'

What video-recorded falls actually look like

The best window into how older adults really fall comes from a study that captured 227 falls on video in long-term-care common areas. The causes were not what folklore suggests: incorrect weight-shifting led at 41%, followed by trip or stumble (21%), hit or bump (11%), loss of support (11%), and collapse (11%) — while slips, the archetypal fall, caused only 3% (Robinovitch et al., The Lancet, 2013). Many falls happened during ordinary low-speed activity: forward walking (24%), standing quietly (13%), and sitting down (12%).

Because these falls begin as a loss of balance rather than a sudden slip, they tend to be slower and softer than a young adult's fall. Measurements bear this out: the pelvis reaches the ground at about 2.14 metres per second in older adults — roughly 16% slower than in young adults — over a descent of well under a second (Robinovitch group, J Biomech, 2015).

Soft doesn't mean harmless — and it's hard to detect

A low-impact fall is still dangerous, because the injury is driven by how you land, not by how hard you hit: a sideways landing carries several times the hip-fracture risk of other configurations (Yang et al., J Bone Miner Res, 2020). And a soft fall that leaves you on the floor unable to get up carries the full weight of the long-lie risk — about half of older home-fallers who lay down for more than an hour died within six months (Wild et al., BMJ 1981).

The soft-fall reality also has a technical consequence: because a real older-adult fall may not produce the sharp jolt that impact-only detectors are tuned for, it can be exactly the fall a detector misses. That is why honest fall detection has to be built around the low-impact fall, not the Hollywood one.

Why check-first detection is designed for soft falls

A detector that waits for a big crash will do well on staged drops and poorly on the falls that actually send older adults to the floor. The more reliable approach pairs a gentler impact trigger with a check on what happens next — did the person come to rest and stay down? — because staying on the floor is the real signal that a fall needs a response.

Phone fall detection is coming to the I'm Alive app in our next update (v2.3.0). When it arrives, it will detect a hard fall, check on you first with a full-screen "Are you okay?" and a countdown, and — only if you don't respond — alert the trusted contacts you chose, with your location. It never calls 911 and is not wired to a monitoring call center; help comes from your own people. It runs on your phone (no pendant or smartwatch to wear), it is opt-in and off by default, and it is best-effort, not a medical device. It is included from the Protect Me plan ($29.99/year), with location on the move on Protect Me On The Move ($39.99/year); the daily check-in is always free (Try It, $0), and there is a one-time Stay Connected lifetime upgrade at $4.99.

This is also why the free daily check-in matters alongside detection: for the softest falls — the slow crumple that no sensor catches, or the fall you survive but can't call about — a missed check-in is the backstop that still reaches your contacts.